RELATED PAPERS TO "GENERALIZATION OF THE TRIGONOMETRIC FUNCTIONS"

L. Yin, L-G. Huang, Y-L. Wang and X-L. Lin,
A survey for generalized trigonometric and hyperbolic functions,
J. Math. Inequal. 13 (2019), no. 3, 833-854.
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S. Sato and S. Takeuchi,
Two double-angle formulas of generalized trigonometric functions,
J. Approx. Theory 250 (2020), 105322.
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S. Takeuchi,
Some double-angle formulas related to a generalized lemniscate function,
The Ramanujan Journal (2021),
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H. Miyakawa and S. Takeuchi,
Applications of a duality between generalized trigonometric and hyperbolic functions,
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